Now also O2 Asia and its exclusive Xda Atom. This ROM update consolidates all the new/previous enhancements and fixes into a single ROM update image which provides improvements to overall performance and quality in system software, application software and GSM radio firmware.
The most important enhancements are the support of Microsoft's Windows Mobile 5.0 AKU 2 including Messaging & Security Feature Pack (MSFP) supporting direct push technology as well as general browser performance improvements and a new Wireless Manager application to provide easy configuration of wireless LAN, Bluetooth and GSM/GPRS/EDGE phone for users.
While the A2DP Bluetooth stereo support isn't mentioned explicit, I expect it's still there, since it was part of the previous ROM versions alreay.